M25PE40-VMN6G View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M25PE40-VMN6G

4 Mbit, low voltage, Page-Erasable Serial Flash memory with byte alterability, 50 MHz SPI bus, standard pinout

STMicroelectronics 

M25PE40

Read Status Register (RDSR)

The Read Status Register (RDSR) instruction al-

lows the Status Register to be read. The Status

Register may be read at any time, even while a

Program, Erase or Write cycle is in progress.

When one of these cycles is in progress, it is rec-

ommended to check the Write In Progress (WIP)

bit before sending a new instruction to the device.

It is also possible to read the Status Register con-

tinuously, as shown in Figure 10..

The status bits of the Status Register are as fol-

lows:

WIP bit. The Write In Progress (WIP) bit indicates

whether the memory is busy with a Write, Program

or Erase cycle. When set to 1, such a cycle is in

progress, when reset to 0 no such cycle is in

progress.

WEL bit. The Write Enable Latch (WEL) bit indi-

cates the status of the internal Write Enable Latch.

When set to 1 the internal Write Enable Latch is

set, when set to 0 the internal Write Enable Latch

is reset and no Write, Program or Erase instruction

is accepted.

Figure 10. Read Status Register (RDSR) Instruction Sequence and Data-Out Sequence

S

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

C

Instruction

D

Status Register Out

Status Register Out

High Impedance

Q

76543210765432107

MSB

MSB

AI02031E

15/37

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